Internal-combustion and other engine, pump, and the like



Oct. 22, .1929. c. B. REDRUP INTERNAL COMBUSTION AND OTHER ENGINE PUMP AND THE LIKE Filed May 4, 1925 3 Sheets-Sheet Fig. 2.

Iain/671%? GB. Red?" AND THE LIKE Oct. 22, 1929.

c. B. RED'RUP INTERNAL COMBUSTION AND OTHER ENGINE PUMP Filed May 4, 1925 5 Sheets-Sheet 2 Imrenfizr CB. Rcdrup Oct. 22, 1929. Q REDRUP 1,732,659

AND THE LIKE INTERNAL COMBUSTION AND OTHER ENGINE. PUMP Filed May 4, 1925 3 Sheets-Sheet 3 l lllf Ifivenlbr 4 CB. fiedr'u Flt gs Patented Oct. 22, 1929 PATENT OFFICE BENJAMIN BEDBUP, OI LEEDS, ENGLAND INTERNAL-COMBUSTION AND OTHER ENGINE, PUMP, AN THE LIKE Application filed May 4, 1925, Serialdio. 27,957, and in Great Britain Kay 9 1824.

This invention relates to internal combustion and-other engines, pumps, and the like of the axial type, that is, of the type comprising a plurality of cylinders forming or secured to a oasin .in which is housed a crank shaft parallel with the-axes of the cylinders and arranged concentrically therein, and a plurality of arms carried upon an inclined crank pin on the crank shaft and connected to the pistons within the cylinders.

The object of the present invent-ion is to provide improvements in the construction and arrangement of engines and the like of the above character, and the invention consists in an internal combustion or other engine, pump, or the like of the type referred to in which each piston is connected to an arm, the arms being individually mounted so that each individually is movable in its own-plane a circumferentially about the crank pin but is rigidly held in the longitudinal direction of the crank pin, this arrangement having the advantage of relieving the arms of all lateral stress and enabling a simple and substantial 5 connection to be made between the arm and its piston while at the same time a very large diameter of arm in proportion to the diameter of piston may be employed.

I The accompanying drawings illustrate two modes of carrying out the invention.

Figure 1 is an end view of one form of engine constructed in accordance with the invention;

Figure 2 is a longitudinal sectional elevaas tion; a

Figure 2 is a section through the boss of Figure '2 and removed from the crank pin.

Figures 3 to 5 are ,Views illustrating details of the piston construction;

Figure 6 is an end View, partly in section, and with the end of one of the cylinders removed,-of a modified form of engine in accordance with the invention, and n Figure 7 is a longitudinal elevation, half as in section, of the engine shown in Figure 6.

Figure 8 is a section through the boss of Figure 7 removed from the crank pin.

Figure 9 is a detail view showing an inner split collar member shown in Figure 7 between the two pins by which the arms forming part of the crank mechanism are pivotally mounted.

In carrying my invention into efi'ect in one convenient manner as, for exam le, in its appllcation' to the production of an internal combustion en ine and as illustrated in Fig ures 1 to 5, I orm my improved engine with a plurality of cylinders an arranged to form a casing surrounding a crank shaft 11 disposed within the casing so as to be parallel to the direction of movement of the pistons c with- 1n the cylinders, the crank shaft'being carrled 1n bearings d at the ends of the casing and having a crank pin e, the axis of which is nclined to the axis of the shaft.

Mounted upon the crank pin is a substantial boss 7 preferably divided by alongitudinal slit 7" lnto two parts to facilitate assembling and havlng end bearings g and a central thrust hearing it and upon such boss I mount the reduced ends 6 of a series of separate arms 2' or a star member, the arms being equal 1n number to the number of cylinders and bemg equal in number to the number' of c l- 1nders and being so arranged as shown in Flgure 2 that while they are free to move circumferentially in relation to the boss they are rigidly held in the longitudinal direction thereof. This may be effected, for example, by arranging the arms orsegmental portions of the star member to be retained in position by a ring nut is at each end of the boss, such ring nuts also serving to hold the two halves of the boss together.

In an alternative construction as shown in Figure 7 each arm may be mounted upon a hmge formed with pins arranged preferably at each end of the boss, one of the arms being made fast to the boss to prevent rolling and in general any construction which will perm1t of theradial movement of the arms to relieve them of lateral stresses and to prevent relative movement between'the arms and piston may be adopted in accordance with the invention.

When the invention is applied to an internal combustion engine of, say, the twostroke type as in Figures 1 to 5, the casing formed by the cylinders is preferably constructed in two parts to facilitate assemblage of such pump heads being provided with an extension m (Figure 1) at one side'to communicate with a transfer pi n located between the cylinders and lea ing to the inlet port of its appropriate cylinder.

Figures 3 to 5 show one convenient method of arranging for the insertion and removal of the gudgeon pin, each piston being for this purpose provided with a removable bush a secured into a boss u n the piston and adapted to retain the gu geon pin 0 in position.

Figures 6 and 7 show a modified form of en e constructed on similar lines to the foregoing, and similar parts are denoted by the same reference letters.

In this construction, however, the cylinders do not in themselves form the casing, but are secured to a stepped conical casing a and ma be air or water cooled, such construction 'ing especially suitable for light engines such as aircraft en 'nes. Further the crank shaft and star mem er are mounted on ball bearings and mechanically operated inlet and exhaust valves are employed in place of the piston controlled ports of the first modification and, moreover, the engine shown is a 10-cylinder engine, each cylinder acting alternately as a working cylinder and as a pump. I

Referring to Figures 7, 8 and 9 it will be seen that the hub assembl is made up of two ooved rings with exten ed sleeves envelopmg the races for the balls 9 and the arrangement is such that first the grooved rings are threaded over the shaft and then the races for the balls 9 with the split bushes within the outer races are assembled on the shaft'ends whereupon the arms 5 are secured in position by means of ins which are inserted from the inside. ubsequently the split collar i" is mounted upon the crank pin between the grooved rings to which the arms 71 are pivoted and is tightened up by the bolts i".

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. In an internal combustion engine or other engine pump or the like, a crank shaft, a plurallty of cylinders arranged circularly around sald crank shaft with their axes parallel to the axis of said shaft, an inclined crank in upon said shaft, a piston within each 0 said cylinders, an arm connected with each piston and means individually mounting said arms on said crank pin whereby each arm individually is slidably movable in its own plane circumferentially about the crank in but is rigidly held a ainst displacement in the longitudinal direction of the crank pin.

arms are mounted, and a ring nut at each end of said boss for holding the parts of the boss together and for retaining the arms in position.

In testimony whereof I have signed my name to this specification. 1

CHARLES BENJAMIN REDRUP. 

